Base de dados : MEDLINE
Pesquisa : B01.206 [Categoria DeCS]
Referências encontradas : 203 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 21 ir para página                         

  1 / 203 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28763480
[Au] Autor:Drumm K; Liebst-Olsen M; Daugbjerg N; Moestrup Ø; Hansen PJ
[Ad] Endereço:Marine Biological Section, Department of Biology, University of Copenhagen, Copenhagen, Denmark.
[Ti] Título:Effects of irradiance and prey deprivation on growth, cell carbon and photosynthetic activity of the freshwater kleptoplastidic dinoflagellate Nusuttodinium (= Gymnodinium) aeruginosum (Dinophyceae).
[So] Source:PLoS One;12(8):e0181751, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The freshwater dinoflagellate Nusuttodinium aeruginosum lacks permanent chloroplasts. Rather it sequesters chloroplasts as well as other cell organelles, like mitochondria and nuclei, from ingested cryptophyte prey. In the present study, growth rates, cell production and photosynthesis were measured at seven irradiances, ranging from 10 to 140 µmol photons m-2s-1, when fed the cryptophyte Chroomonas sp. Growth rates were positively influenced by irradiance and increased from 0.025 d-1 at 10 µmol photons m-2s-1 to maximum growth rates of ~0.3 d-1 at irradiances ≥ 40 µmol photons m-2s-1. Similarly, photosynthesis ranged from 1.84 to 36.9 pg C cell-1 h-1 at 10 and 140 µmol photons m-2s-1, respectively. The highest rates of photosynthesis in N. aeruginosum only corresponded to ~25% of its own cell carbon content and estimated biomass production. The measured rates of photosynthesis could not explain the observed growth rates at high irradiances. Cultures of N. aeruginosum subjected to prey starvation were able to survive for at least 27 days in the light. The sequestered chloroplasts maintained their photosynthetic activity during the entire period of starvation, during which the population underwent 4 cell divisions. This indicates that N. aeruginosum has some control of the chloroplasts, which may be able to replicate. In conclusion, N. aeruginosum seems to be in an early stage of chloroplast acquisition with some control of its ingested chloroplasts.
[Mh] Termos MeSH primário: Carbono/metabolismo
Núcleo Celular/metabolismo
Cloroplastos/metabolismo
Dinoflagelados/fisiologia
Mitocôndrias/metabolismo
Fotossíntese
[Mh] Termos MeSH secundário: Biomassa
Criptófitas
Relação Dose-Resposta à Radiação
Água Doce
Luz
Microscopia de Fluorescência
Fótons
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
7440-44-0 (Carbon)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170802
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0181751


  2 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28483512
[Au] Autor:Rayner TA; Jørgensen NOG; Drillet G; Hansen BW
[Ad] Endereço:Department of Science and Environment, Roskilde University, DK-4000 Roskilde, Denmark; Institute of Marine Biology, National Taiwan Ocean University, Keelung 20224, Taiwan. Electronic address: tar@ruc.dk.
[Ti] Título:Changes in free amino acid content during naupliar development of the Calanoid copepod Acartia tonsa.
[So] Source:Comp Biochem Physiol A Mol Integr Physiol;210:1-6, 2017 Aug.
[Is] ISSN:1531-4332
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Changes in free amino acids (FAA) were investigated in the potentially important live feed and neritic copepod species Acartia tonsa during naupliar development. Total content of FAA in A. tonsa nauplii was around 17% of dry weight at first development stage, and declined to 6% for later stages. Relative to body-volume and biomass, the FAA content indicated possible volume-dependent changes. However, changes in FAA with osmolytic activity could not account for this decline in FAA content, but suggests that the decline reflected degradation of residual FAAs from the embryonic stage. Glutamic acid revealed the largest change in relative abundance during naupliar development and declined from 29.0% at first nauplius stage to 7.1% at later stages. The high FAA pool in early naupliar stages may be necessary for naupliar development due to an absence of feeding at first development stages. The high FAA content in early nauplii indicates that A. tonsa is a valuable source for nutritional energy for first-feeding fish larvae and should be further exploited for aquaculture purposes. Enhancements to FAA abundances in nauplii through manipulation of maternal diets could be of future interest, as copepod nauplii can contain a substantial pool of FAAs at first development stage.
[Mh] Termos MeSH primário: Aminoácidos/metabolismo
Copépodes/crescimento & desenvolvimento
Copépodes/metabolismo
[Mh] Termos MeSH secundário: Animais
Copépodes/fisiologia
Criptófitas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amino Acids)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170724
[Lr] Data última revisão:
170724
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170510
[St] Status:MEDLINE


  3 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28445483
[Au] Autor:Langer JAF; Sharma R; Schmidt SI; Bahrdt S; Horn HG; Algueró-Muñiz M; Nam B; Achterberg EP; Riebesell U; Boersma M; Thines M; Schwenk K
[Ad] Endereço:Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Biologische Anstalt Helgoland, Germany.
[Ti] Título:Community barcoding reveals little effect of ocean acidification on the composition of coastal plankton communities: Evidence from a long-term mesocosm study in the Gullmar Fjord, Skagerrak.
[So] Source:PLoS One;12(4):e0175808, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The acidification of the oceans could potentially alter marine plankton communities with consequences for ecosystem functioning. While several studies have investigated effects of ocean acidification on communities using traditional methods, few have used genetic analyses. Here, we use community barcoding to assess the impact of ocean acidification on the composition of a coastal plankton community in a large scale, in situ, long-term mesocosm experiment. High-throughput sequencing resulted in the identification of a wide range of planktonic taxa (Alveolata, Cryptophyta, Haptophyceae, Fungi, Metazoa, Hydrozoa, Rhizaria, Straminipila, Chlorophyta). Analyses based on predicted operational taxonomical units as well as taxonomical compositions revealed no differences between communities in high CO2 mesocosms (~ 760 µatm) and those exposed to present-day CO2 conditions. Observed shifts in the planktonic community composition were mainly related to seasonal changes in temperature and nutrients. Furthermore, based on our investigations, the elevated CO2 did not affect the intraspecific diversity of the most common mesozooplankter, the calanoid copepod Pseudocalanus acuspes. Nevertheless, accompanying studies found temporary effects attributed to a raise in CO2. Differences in taxa composition between the CO2 treatments could, however, only be observed in a specific period of the experiment. Based on our genetic investigations, no compositional long-term shifts of the plankton communities exposed to elevated CO2 conditions were observed. Thus, we conclude that the compositions of planktonic communities, especially those in coastal areas, remain rather unaffected by increased CO2.
[Mh] Termos MeSH primário: Código de Barras de DNA Taxonômico
Plâncton/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Alveolados/genética
Alveolados/crescimento & desenvolvimento
Alveolados/metabolismo
Dióxido de Carbono/análise
Clorofila/análise
Criptófitas/genética
Criptófitas/crescimento & desenvolvimento
Criptófitas/metabolismo
DNA/química
DNA/isolamento & purificação
DNA/metabolismo
Fungos/genética
Fungos/crescimento & desenvolvimento
Fungos/metabolismo
Sequenciamento de Nucleotídeos em Larga Escala
Concentração de Íons de Hidrogênio
Oceanos e Mares
Plâncton/genética
Plâncton/metabolismo
RNA Ribossômico 18S/química
RNA Ribossômico 18S/isolamento & purificação
RNA Ribossômico 18S/metabolismo
Análise de Sequência de DNA
Suécia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 18S); 1406-65-1 (Chlorophyll); 142M471B3J (Carbon Dioxide); 9007-49-2 (DNA); YF5Q9EJC8Y (chlorophyll a)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170906
[Lr] Data última revisão:
170906
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170427
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0175808


  4 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28391323
[Au] Autor:Roy SW
[Ad] Endereço:Department of Biology, San Francisco State University, San Francisco, CA.
[Ti] Título:Genomic and Transcriptomic Analysis Reveals Spliced Leader Trans-Splicing in Cryptomonads.
[So] Source:Genome Biol Evol;9(3):468-473, 2017 Mar 01.
[Is] ISSN:1759-6653
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Spliced leader trans-splicing (SLTS) is a poorly understood mechanism that is found in a diversity of eukaryotic lineages. In SLTS, a short RNA sequence is added near the 5' ends of the transcripts of protein-coding genes by a modified spliceosomal reaction. Available data suggest that SLTS has evolved many times, and might be more likely to evolve in animals. That SLTS might be more likely to evolve in the context of the generally complex transcriptomes characteristic of animals suggests the possibility that SLTS functions in gene regulation or transcriptome diversification, however no general novel function for SLTS is known. Here, I report SLTS in a lineage of cellularly complex unicellular eukaryotes. Cryptomonads are a group of eukaryotic algae that acquired photosynthetic capacity by secondary endosymbiosis of a red alga, and that retain a reduced copy of the nucleus of the engulfed alga. I estimate that at least one-fifth of genes in the model cryptomonad Guillardia theta and its relative Hanusia phi undergo SLTS. I show that hundreds of genes in G. theta generate alternative transcripts by SLTS at alternative sites, however I find little evidence for alternative protein production by alternative SLTS splicing. Interestingly, I find no evidence for substantial operon structure in the G. theta genome, in contrast to previous findings in other lineages with SLTS. These results extend SLTS to another major group of eukaryotes, and heighten the mystery of the evolution of SLTS and its association with cellular and transcriptomic complexity.
[Mh] Termos MeSH primário: Criptófitas/genética
RNA Líder para Processamento/genética
Trans-Splicing/genética
Transcriptoma/genética
[Mh] Termos MeSH secundário: Genômica
Filogenia
Simbiose/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Spliced Leader)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171026
[Lr] Data última revisão:
171026
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170410
[St] Status:MEDLINE
[do] DOI:10.1093/gbe/evx012


  5 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28334157
[Au] Autor:Debroas D; Domaizon I; Humbert JF; Jardillier L; Lepère C; Oudart A; Taïb N
[Ad] Endereço:Université Clermont Auvergne, CNRS, Laboratoire: Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France.
[Ti] Título:Overview of freshwater microbial eukaryotes diversity: a first analysis of publicly available metabarcoding data.
[So] Source:FEMS Microbiol Ecol;93(4), 2017 Apr 01.
[Is] ISSN:1574-6941
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Although they are widespread, diverse and involved in biogeochemical cycles, microbial eukaryotes attract less attention than their prokaryotic counterparts in environmental microbiology. In this study, we used publicly available 18S barcoding data to define biases that may limit such analyses and to gain an overview of the planktonic microbial eukaryotic diversity in freshwater ecosystems. The richness of the microbial eukaryotes was estimated to 100 798 operational taxonomic units (OTUs) delineating 1267 clusters or phylogenetic units (PUs, i.e. monophyletic groups of OTUs that are phylogenetically close). By summing the richness found in aquatic environments, we can predict the microbial eukaryotic richness to be around 200 000-250 000 species. The molecular diversity of protists in freshwater environments is generally higher than that of the morphospecies and cultivated species catalogued in public databases. Amoebozoa, Viridiplantae, Ichthyosporea, and Cryptophyta are the most phylogenetically diverse taxa, and characterisation of these groups is still needed. A network analysis showed that Fungi, Stramenopiles and Viridiplantae play central role in lake ecosystems. Finally, this work provides guidance for compiling metabarcoding data and identifies missing data that should be obtained to increase our knowledge on microbial eukaryote diversity.
[Mh] Termos MeSH primário: Eucariotos/classificação
Plâncton/classificação
[Mh] Termos MeSH secundário: Criptófitas/classificação
Ecossistema
Fungos/classificação
Lagos/microbiologia
Filogenia
Estramenópilas/classificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170324
[St] Status:MEDLINE
[do] DOI:10.1093/femsec/fix023


  6 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27868387
[Au] Autor:Shulse CN; Maillot B; Smith CR; Church MJ
[Ad] Endereço:Center for Microbial Oceanography: Research and Education (C-MORE), University of Hawaii at Manoa, Honolulu, HI, USA.
[Ti] Título:Polymetallic nodules, sediments, and deep waters in the equatorial North Pacific exhibit highly diverse and distinct bacterial, archaeal, and microeukaryotic communities.
[So] Source:Microbiologyopen;6(2), 2017 Apr.
[Is] ISSN:2045-8827
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Concentrated seabed deposits of polymetallic nodules, which are rich in economically valuable metals (e.g., copper, nickel, cobalt, manganese), occur over vast areas of the abyssal Pacific Ocean floor. Little is currently known about the diversity of microorganisms inhabiting abyssal habitats. In this study, sediment, nodule, and water column samples were collected from the Clarion-Clipperton Zone of the Eastern North Pacific. The diversities of prokaryote and microeukaryote communities associated with these habitats were examined. Microbial community composition and diversity varied with habitat type, water column depth, and sediment horizon. Thaumarchaeota were relatively enriched in the sediments and nodules compared to the water column, whereas Gammaproteobacteria were the most abundant sequences associated with nodules. Among the Eukaryota, rRNA genes belonging to the Cryptomonadales were relatively most abundant among organisms associated with nodules, whereas rRNA gene sequences deriving from members of the Alveolata were relatively enriched in sediments and the water column. Nine operational taxonomic unit (OTU)s were identified that occur in all nodules in this dataset, as well as all nodules found in a study 3000-9000 km from our site. Microbial communities in the sediments had the highest diversity, followed by nodules, and then by the water column with <1/3 the number of OTUs as in the sediments.
[Mh] Termos MeSH primário: Archaea/classificação
Criptófitas/classificação
Sedimentos Geológicos/microbiologia
Sedimentos Geológicos/parasitologia
Microbiota/genética
Proteobactérias/classificação
[Mh] Termos MeSH secundário: Organismos Aquáticos/classificação
Organismos Aquáticos/genética
Archaea/genética
Archaea/isolamento & purificação
Cobalto/isolamento & purificação
Cobre/isolamento & purificação
Criptófitas/genética
Criptófitas/isolamento & purificação
DNA Arqueal/genética
DNA Bacteriano/genética
DNA Ribossômico/genética
Manganês/isolamento & purificação
Níquel/isolamento & purificação
Oceano Pacífico
Proteobactérias/genética
Proteobactérias/isolamento & purificação
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Archaeal); 0 (DNA, Bacterial); 0 (DNA, Ribosomal); 0 (RNA, Ribosomal, 16S); 3G0H8C9362 (Cobalt); 42Z2K6ZL8P (Manganese); 789U1901C5 (Copper); 7OV03QG267 (Nickel)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161122
[St] Status:MEDLINE
[do] DOI:10.1002/mbo3.428


  7 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27827804
[Au] Autor:Khomich M; Kauserud H; Logares R; Rasconi S; Andersen T
[Ad] Endereço:Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway.
[Ti] Título:Planktonic protistan communities in lakes along a large-scale environmental gradient.
[So] Source:FEMS Microbiol Ecol;93(4), 2017 Apr 01.
[Is] ISSN:1574-6941
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Despite their obvious importance, our knowledge about the eukaryotic microbial diversity of inland waters is still limited and poorly documented. We applied 18S rDNA amplicon sequencing to provide a comprehensive analysis of eukaryotic diversity in 74 low-productivity lakes along a 750 km longitudinal transect (5.40-18.52°E) across southern Scandinavia. We detected a wide diversity of pelagic microbial eukaryotes, classified into 1882 operational taxonomic units (OTUs). The highest OTU richness was found in traditional phytoplankton groups like Dinoflagellata, Chrysophyceae, Chlorophyta and Cryptophyta. A total of 53.6% OTUs were primarily autotrophic, while 19.4% of the heterotrophic OTUs belonged to putative parasitic taxa. Except for a longitudinal trend in the relative influence of mixotrophs, there were no significant associations between major functional groups (autotrophs, heterotrophs and parasites) and spatial and environmental variables. Community dissimilarity increased significantly with increasing geographical distance between lakes. In accordance with earlier, microscopy-based surveys in this region, we demonstrate distinct gradients in protistan diversity and community composition, which are better explained by spatial structure than local environment. The strong association between longitude and protistan diversity is probably better explained by differences in regional species pools due to differences in landscape productivity than by dispersal limitation or climatic constraints.
[Mh] Termos MeSH primário: Eucariotos/classificação
Lagos
Plâncton/classificação
[Mh] Termos MeSH secundário: Alveolados/genética
Criptófitas/genética
DNA de Protozoário/genética
DNA Ribossômico/genética
Eucariotos/genética
Sequenciamento de Nucleotídeos em Larga Escala
Lagos/parasitologia
RNA Ribossômico 18S/genética
Países Escandinavos e Nórdicos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Protozoan); 0 (DNA, Ribosomal); 0 (RNA, Ribosomal, 18S)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170516
[Lr] Data última revisão:
170516
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161110
[St] Status:MEDLINE
[do] DOI:10.1093/femsec/fiw231


  8 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27764899
[Au] Autor:Lee CS; Fisher NS
[Ad] Endereço:School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, USA.
[Ti] Título:Bioaccumulation of methylmercury in a marine copepod.
[So] Source:Environ Toxicol Chem;36(5):1287-1293, 2017 May.
[Is] ISSN:1552-8618
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Methylmercury (MeHg) is known to biomagnify in marine food chains, resulting in higher concentrations in upper trophic level animals than their prey. To better understand how marine copepods, an important intermediate between phytoplankton and forage fish at the bottom of the food chain, assimilate and release MeHg, the authors performed a series of laboratory experiments using the gamma-emitting radiotracer Hg and Me Hg with the calanoid copepod Acartia tonsa. Assimilation efficiencies of Hg and MeHg ranged from 25% to 31% and 58% to 79%, respectively, depending on algal diets. Assimilation efficiencies were positively related to the fraction of Hg in the cytoplasm of the algal cells that comprised their diet. Efflux rates of Hg (0.29/d) and MeHg (0.21/d) following aqueous uptake were similar, but efflux rates following dietary uptake were significantly lower for MeHg (0.11-0.22/d) than Hg (0.47-0.66/d). The calculated trophic transfer factors in copepods were >1 for MeHg and consistently low (≤0.2) for Hg . The authors used the parameters measured to quantitatively model the relative importance of MeHg sources (water or diet) for copepods and to predict the overall MeHg concentrations in copepods in different marine environments. In general, MeHg uptake from the diet accounted for most of the body burden in copepods (>50%). For an algal diet with a MeHg dry weight bioconcentration factor ≥10 , >90% of a copepod's MeHg body burden can be shown to derive from the diet. The model-predicted MeHg concentrations in the copepods were comparable to independent measurements for copepods in coastal and open-ocean regions, implying that the measured parameters and model are applicable to natural waters. Environ Toxicol Chem 2017;36:1287-1293. © 2016 SETAC.
[Mh] Termos MeSH primário: Copépodes/química
Compostos de Metilmercúrio/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Animais
Carga Corporal (Radioterapia)
Copépodes/metabolismo
Criptófitas/metabolismo
Cadeia Alimentar
Íons/química
Mercúrio/análise
Mercúrio/metabolismo
Radioisótopos de Mercúrio/química
Compostos de Metilmercúrio/metabolismo
Compostos de Metilmercúrio/toxicidade
Fitoplâncton/química
Fitoplâncton/metabolismo
Poluentes Químicos da Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ions); 0 (Mercury Radioisotopes); 0 (Methylmercury Compounds); 0 (Water Pollutants, Chemical); FXS1BY2PGL (Mercury)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170701
[Lr] Data última revisão:
170701
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161021
[St] Status:MEDLINE
[do] DOI:10.1002/etc.3660


  9 / 203 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27633748
[Au] Autor:Mysliwa-Kurdziel B; Solymosi K
[Ad] Endereço:Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland.
[Ti] Título:Phycobilins and Phycobiliproteins Used in Food Industry and Medicine.
[So] Source:Mini Rev Med Chem;17(13):1173-1193, 2017.
[Is] ISSN:1875-5607
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Open tetrapyrroles termed phycobilins represent the major photosynthetic accessory pigments of several cyanobacteria and some eukaryotic algae such as the Glaucophyta, Cryptophyta and Rhodophyta. These pigments are covalently bound to so-called phycobiliproteins which are in general organized into phycobilisomes on the thylakoid membranes. OBJECTIVE & METHODS: In this work we first briefly describe the physico-chemical properties, biosynthesis, occurrence, in vivo localization and roles of the phycobilin pigments and the phycobiliproteins. Then the potential applications and uses of these pigments, pigment-protein complexes and related products by the food industry (e.g., as LinaBlue® or the so-called spirulina extract used as coloring food), by the health industry or as fluorescent dyes are critically reviewed. CONCLUSION: In addition to the stability, bioavailability and safety issues of purified phycobilins and phycobiliproteins, literature data about their antioxidant, anticancer, anti-inflammatory, immunomodulatory, hepatoprotective, nephroprotective and neuroprotective effects, and their potential use in photodynamic therapy (PDT) are also discussed.
[Mh] Termos MeSH primário: Corantes de Alimentos/química
Ficobilinas/biossíntese
Ficobiliproteínas/biossíntese
[Mh] Termos MeSH secundário: Anti-Inflamatórios/química
Anti-Inflamatórios/metabolismo
Anti-Inflamatórios/uso terapêutico
Antineoplásicos/química
Antineoplásicos/metabolismo
Antineoplásicos/uso terapêutico
Antioxidantes/química
Antioxidantes/metabolismo
Antioxidantes/uso terapêutico
Doenças Cardiovasculares/patologia
Doenças Cardiovasculares/prevenção & controle
Criptófitas/química
Criptófitas/metabolismo
Seres Humanos
Fatores Imunológicos/química
Fatores Imunológicos/metabolismo
Fatores Imunológicos/uso terapêutico
Neoplasias/patologia
Neoplasias/prevenção & controle
Doenças Neurodegenerativas/patologia
Doenças Neurodegenerativas/prevenção & controle
Ficobilinas/química
Ficobiliproteínas/química
Rodófitas/química
Rodófitas/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Anti-Inflammatory Agents); 0 (Antineoplastic Agents); 0 (Antioxidants); 0 (Food Coloring Agents); 0 (Immunologic Factors); 0 (Phycobilins); 0 (Phycobiliproteins)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170912
[Lr] Data última revisão:
170912
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160917
[St] Status:MEDLINE
[do] DOI:10.2174/1389557516666160912180155


  10 / 203 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27861576
[Au] Autor:Cihlár J; Füssy Z; Horák A; Oborník M
[Ad] Endereço:Biology Centre, Czech Academy of Sciences, Institute of Parasitology, Ceské Budejovice, Czech Republic.
[Ti] Título:Evolution of the Tetrapyrrole Biosynthetic Pathway in Secondary Algae: Conservation, Redundancy and Replacement.
[So] Source:PLoS One;11(11):e0166338, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Tetrapyrroles such as chlorophyll and heme are indispensable for life because they are involved in energy fixation and consumption, i.e. photosynthesis and oxidative phosphorylation. In eukaryotes, the tetrapyrrole biosynthetic pathway is shaped by past endosymbioses. We investigated the origins and predicted locations of the enzymes of the heme pathway in the chlorarachniophyte Bigelowiella natans, the cryptophyte Guillardia theta, the "green" dinoflagellate Lepidodinium chlorophorum, and three dinoflagellates with diatom endosymbionts ("dinotoms"): Durinskia baltica, Glenodinium foliaceum and Kryptoperidinium foliaceum. Bigelowiella natans appears to contain two separate heme pathways analogous to those found in Euglena gracilis; one is predicted to be mitochondrial-cytosolic, while the second is predicted to be plastid-located. In the remaining algae, only plastid-type tetrapyrrole synthesis is present, with a single remnant of the mitochondrial-cytosolic pathway, a ferrochelatase of G. theta putatively located in the mitochondrion. The green dinoflagellate contains a single pathway composed of mostly rhodophyte-origin enzymes, and the dinotoms hold two heme pathways of apparently plastidal origin. We suggest that heme pathway enzymes in B. natans and L. chlorophorum share a predominantly rhodophytic origin. This implies the ancient presence of a rhodophyte-derived plastid in the chlorarachniophyte alga, analogous to the green dinoflagellate, or an exceptionally massive horizontal gene transfer.
[Mh] Termos MeSH primário: Evolução Biológica
Vias Biossintéticas
Criptófitas/metabolismo
Diatomáceas/metabolismo
Dinoflagelados/metabolismo
Tetrapirróis/metabolismo
[Mh] Termos MeSH secundário: Vias Biossintéticas/genética
Criptófitas/classificação
Criptófitas/genética
Diatomáceas/classificação
Diatomáceas/genética
Dinoflagelados/classificação
Dinoflagelados/genética
Perfilação da Expressão Gênica
Heme/metabolismo
Filogenia
Sintase do Porfobilinogênio/genética
Sintase do Porfobilinogênio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Tetrapyrroles); 42VZT0U6YR (Heme); EC 4.2.1.24 (Porphobilinogen Synthase)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170626
[Lr] Data última revisão:
170626
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161119
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0166338



página 1 de 21 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde